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Molecular Theory and Spectroscopy

Our department is interested in fundamental science related to the activation of small molecules by transition metals in a broad sense as well as in the development and application of quantum chemical methods. The activities of the group span the three major, interrelated areas:

I.   Development of new quantum chemical methods
II.  Computational chemistry
III. Molecular spectroscopy

The leading overall motivation is to unravel reaction mechanisms of complex, transition metal catalyzed reactions at the electronic structure level. As the experimental means of addressing electronic structure involves various forms of spectroscopy, a thorough understanding of structure/spectra relationships is of paramount importance (and clearly branches into the area of material science). Furthermore, the characterization of reaction intermediates can in almost all cases only proceed through a thorough interpretation of spectra taken under transient or quench conditions.

The department for molecular theory and spectroscopy takes a rather unique approach to the analysis of catalytic reactions. The focus of the work is a close interconnection between theory and experiment. On the experimental side, a wide range of spectroscopic methods is used  to study catalytic systems, partially under in-operando conditions. The spectroscopic data contains information about the geometric and electronic structures of the systems under investigation. The information content of the data can, however, only be fully developed by supplementing the experimental data with quantum chemical calculations. In this way, one not only is able to interpret the experimental data to its full capacity but also obtains critical feedback about the validity of the calculations. The insights obtained about electronic structures and reaction mechanisms help in the design of new, improved catalysts. This approach can be implemented in all areas of catalysis including homogeneous, heterogeneous and biological catalysis and therefore complements the activities of the other departments at the MPI Kofo. In addition to chemical applications, the department is also deeply involved in the development of new theoretical methods with a focus on theoretical spectroscopy and highly accurate correlated wavefunction approaches to large molecular systems. The offspring of these efforts is the ORCA program, a general purpose quantum chemistry suite that belong to the most widely used electronic structure packages world wide.

Frank Neese

Prof. Dr. Frank Neese

since 2018
Director, Max-Planck-Institut für Kohlenforschung
since 2013
Honorary Professor, Rheinische Friedrich-Wilhelms-Universität Bonn
2011-2017
Director, MPI for Bioanorganic Chemistry; today: MPI CEC
2008-2011
Max-Planck-Fellow, MPI for Bioanorganic Chemistry; today: MPI CEC
2006-2011
Full Professor and Chair, Theoretical Chemistry, University of Bonn
2001-2006
Staff Scientist, MPI for Bioanorganic Chemistry; today: MPI CEC (2001-2006)
2001
Habilitation Bioanorganische und Theoretische Chemie, Universität Konstanz
1997-1999
Postdoc, Stanford University (with Prof. E. I. Solomon)
1997
Ph.D. (Dr. rer. nat.), University of Konstanz (with Prof. Kroneck)
1993
Diplom (Biology), University of Konstanz (with Prof. P. Kroneck)
2017
Ceremonial Lecturer on the occasion of the 150th Anniversary of the Gesellschaft Deutscher Chemiker (GDCh) and the 125th Anniversary of the journal
2017
Ceremonial Lecturer on the occasion of the 10th anniversary of UniCat and BIG-NSE, Berlin, Germany
2017
The 27th Rudolf Brdička Memorial Lecturer at the J. Heyrovsky Institute of Physical Chemistry, Prague, Czech Republic
2017
Johnston Lectureship in honor of Harold Johnston, Emory University, Atlanta, GA, USA
2017
Löwdin Lectureship, Quantum Theory Project, University of Florida, Gainesville, FL, USA
2017
Award Lecturer, William B. Tolman Award Symposium, 253rd ACS National Meeting & Exposition, San Francisco, CA, USA
2017
Ceremonial Lecturer on the occasion of "The 2017 Golden Symposium of the Lise Meitner Center for Computational Quantum Chemistry", Jerusalem, Israel
2016
"The Roger E. Miller Lecturer" on the occasion of the The 32nd Symposium on Chemical Physics at the University of Waterloo (SCP 2016), Waterloo, Canada
2016
"Conseils Solvay" Lecturer on the occasion of the 24th Solvay Conference on Chemistry – Catalysis in Chemistry and Biology, Brussels, Belgium
2016
Ceremonial Lecturer on the occasion of the awards ceremony of the Dr. Barbara Mez-Starck-Stiftung, Ulm, Germany
2016
Coulson Lectureship, University of Georgie, Athens, Georgia
2015
Member of the exclusive circle of invited guests on the occassion of the bilateral celebration of "50 years German-Israeli diplomatic relations" Symposium: "Chemistry: The Central Science" of the Leopoldina and the Israel Academy of Sciences and Humanities (IASH)
2015
"Thomson Reuters Highly Cited Researcher", listed among the worldwide top 1% cited researchers
2015
Davidson Lectureship, University of North Texas, Denton, Texas
2014
"Kohlenforschung Centennial Lectureship", Max-Planck-Institut für Kohlenforschung, Germany
2013
“Jean Perrin Reader” for the year 2013
2013
Schulich Lectureship, University of Haifa. Honorary member of the Israelian Society of Chemistry
2013
Election to the Leopoldina Nationale Akademie der Wissenschaften (Germany National Academy of Sciences)
2012
Election to the International Academy of Quantum Molecular Sciences
2010
Gottfried-Wilhelm Leibniz Award of the German Science Foundation
2010
McElvain Lecture, University of Wisconsin, Madison, USA
2009
Early Career Award of the International Society for Bioinorganic Chemistry
2008
Klung-Wilhelmy-Weberbank award for outstanding young German Chemists and Physicists
2008
First Chemist to be appointed as “Max Planck fellow” of the Max Planck Society
2007
Lise Meitner Award for "Outstanding young German Scientists" from the Minerva Supercomputing Center, Hebrew University, Jerusalem, Israel
2005
Award of the Northrhine-Westfalia Academy of Sciences for outstanding contributions of younger scientists (download speech Karl-Arnold Preis)
2005
Hellmann Award of the German Theoretical Chemistry Society for the Development and Application of new Theoretical Methods
since 2016
Member of the Editorial Board of the review book series Structure and Bonding
since 2016
Active member of the International Advisory Board for the Institute of Organic Chemistry and Biochemistry (IOCB) of the Czech Academy of Sciences, Prague
since 2016
Member of the Review Board „Physical and Theoretical Chemistry“ in the field of „General Theoretical Chemistry“ of the Deutsche Forschungsgemeinschaft (German Research Foundation, DFG)
since 2016
Member of the International Advisory Board for the Institute of Organic Chemistry and Biochemistry (IOCB) of the Czech Academy of Sciences in Prague
since 2015
Spokesperson and founder of the International Max Planck Research School on Reactive Structure Analysis for Chemical Reactions (IMPRS-RECHARGE)
since 2015
Associate Editor of the Journal Inorganic Chemistry
since 2014
Member of the GDCh-Selection Commitee for the Liebig-Denkmünze
since 2013
Leopoldina, Nationale Akademie der Wissenschaften
since 2012
International Academy of Quantum Molecular Science
since 2012
Associate Editor PhysChemChemPhys
2008-2011
Spokesperson of SFB 813
since 2007
Editorial board of J. Biol. Inorg. Chem.
since 2001
AG Theoretische Chemie (German Theoretical Chemical Society)
since 2000
Head of the Hellmann Award committee
since 2000
Deutsche Biophysikalische Gesellschaft (German Biophysical Society)
since 2000
Gesellschaft Deutscher Chemiker (German Chemical Society)
since 1995
Society for Biological Inorganic Chemistry
since 1992
International EPR Society
  • RESOLV - Cluster of Excellence 1069 - RESOLV (Ruhr Explores Solvation) - Understanding and Design of Solvent Controlled Processes (link)

Forschungsthemen

Quantum chemical method development

Quantum chemical method development

In our group, the large-scale quantum chemistry program ORCA is developed. ORCA is a highly-efficient, flexible and user friendly quantum chemistry program that is intensely used by a quickly growing user community of about 15,000 researchers worldwide. Its features are fully described elsewhere[2].

ORCA features all common standard functionality involving density functional theory (DFT), correlated single- (CCSD(T)) and multireference (MR-CI, SORCI, NEVPT2) ab initio wavefunction  methods, as well as semi-empirical methods. ORCA is particularly well suited for the calculation of molecular spectra and is widely used by spectroscopists in various areas of research ranging from solid state chemistry to pharmacology.

One obvious goal of the theoretical method development is to enhance the efficiency and accuracy of theoretical methods and thereby push the boundaries of what is possible with computational chemistry. In recent years, a particular focus has been the development and application of low-order scaling electron correlation methods. This has led to the domain-based local pair natural orbital (DLPNO) family of methods that we regard as ‘breakthrough’ technology in the application of ab initio quantum mechanics to chemistry.[3] In a nutshell, DLPNO methods recover about 99.9% of the canonical correlation energy but the computational effort scales linearly with system size and with a sufficiently low prefactor to treat molecules with hundreds of atoms on standard hardware.

The DLPNO family presently spans DLPNO-MP2[3f] and DLPNO-CCSD(T)[3a, 3h, 3i] in the single-reference case as well as DLPNO-NEVPT2 and DLPNO-Mk-MRCC in the multireference case. DLPNO is based on the powerful concept of SparseMaps that we have developed in order to simplify the complex task of implementing high-level, linear scaling quantum chemical methods.[3f] Methods have been developed for closed-[3a, 3h, 3i]  and open-[4] shell systems, molecular properties,[3e] excited states[3d] and explicit correlation.[3b]

While the single-reference problem appears to be well under control based on the DLPNO concepts, much more work remains to be done in the multi-reference case. The latter methods are instrumental to treat complicated multiplet problems, bond breaking phenomena and magnetic properties. We have intensely worked on several aspects of this very challenging problem. First of all, DLPNO concepts have been used to achieve a linear scaling DLPNO-NEVPT2 method that provides 99.9% of the correlation energy reliably. Starting from there, several new developments are: a) the ability to treat much larger reference spaces with fifty and more orbitals using the new iterative configuration expansion (ICE-CI) algorithm (a variant of the CIPSI method[5]), b) a differential correlation dressed CAS (DCD-CAS) method to address the limitations of the internal contraction scheme, c) internally contracted multi-reference configuration interaction (FIC-MRCI)[6] and coupled cluster (FIC-MRCC) approaches to achieve higher accuracy than NEVPT2. d) a smoother approach to the one-particle basis set limit using explicit correlation and e) the incorporation of relativistic effects using quasi-degenerate perturbation theory.

These challenging developments are greatly aided by new technology to directly and automatically implement complex theories using an automatic code generator (ORCA-AGE) that reduces development times from years to days.[7]

 

Computational chemistry
Computational chemistry

Computational chemistry

Our computational chemistry applications center around the reactions depicted above. Areas of recent interest are centered around:

(a)   The oxidation of water by the oxygen evolving complex (OEC) of Photosystem II (PSII). This research area is led by Dr. Dimitrios Pantazis and is carried out in close collaboration with the department of Prof. Wolfgang Lubitz. The efforts that have led to the proposal of a refined structure for the OEC that is consistent with all crystallographic and spectroscopic data.[2, 19] Our desire to understand the reaction mechanism of the OEC on the basis of its spectroscopic properties[2, 19a, 19e] has led us to consider the properties of manganese complexes in greater detail and has led to a series of systematic investigations on manganese monomers, dimers and oligomers e.g.[10c, 11b, 20] Recent reviews summarize the state of affairs.[19c, 21]
Figure 9
Fig. 9: A combination of X-ray emission and quantum chemistry reveals that the active site of nitrogenase contains a central carbide ion.

(b)  The activation of dinitrogen, one of the most inert molecules known in chemistry, by the enzyme nitrogenase is another focus of research in the group. This research area is headed by Prof. Serena DeBeer.[22] Despite intense research efforts, even the structural basis for biological nitrogen fixation has been proven elusive. Highlights include the identification of the central atom in the active site of nitrogenase to be a carbide through the combination of X–ray emission spectroscopy with quantum chemistry,[22f] the assignment of the molybdenum oxidation state as Mo(III)[22e] as well as the characterization of a nitrogen activating trinuclear iron complex (in collaboration with the group of Prof. Patrick Holland, Rochester, USA).[23]
Figure 10
Fig. 10 Left: the molecular orbitals of CO2 in linear and bent configurations. Middle: The total energy and the orbital energies of CO2 along the bending mode showing that if CO2 can be bent a low energy π* acceptor orbital becomes available as electron acceptor. Right: Correlation between the H2 splitting barrier and the hydricity of coordinated CO2 in CO2 hydrogenation reactions.

(c)  The activation of CO2, another extremely inert molecule  is one of the most important reactions in energy research. Conversion of CO2 to alcohols or other energy rich molecules could solve CO2 pollution problems and provide liquid fuels at the same time. Our research in this area is headed by Dr. Shengfa Ye.[24]
Figure 11
Fig. 11: The electronic structure analysis of the C-H bond activation catalyzed by high-valent iron(IV)-oxo species reveals that en route to the transition state an oxyl radical is formed that acts as a strong electrophile capable of attacking the C-H bond.

(d)  The spectroscopy and reactivity of high-valent iron centers in iron enzymes and low-molecular weight catalysts. These research efforts are coordinated by Dr. Eckhard Bill (spectroscopy) and Dr. Shengfa Ye (theory).[25] A special focus of the DeBeer group is the study of the reaction mechanism of the important enzyme Methane Monooxygenase that features a dinuclear iron active site and catalyzes the chemically extremely complex transformation from methane to methanol. Highlights include the characterization of Fe(V)[26] and Fe(VI)[27] complexes (in collaboration with the former director, Prof. Karl Wieghardt), the detailed analysis of C-H bond activation reactions[28],[25a, 25e, 29] and the fascinatingly complex chemistry of iron-nitrosyls.[30]

(e)  Molecular magnetism, is a fascinating research field that has been a long term interest of the department. The ultimate goal is the design of molecules (SMMs) that show magnetic hysteresis at elevated temperatures (ideally room temperature). While this goal has been proven elusive so far, important progress has been made. Importantly, after it has been realized that big oligonuclear clusters are not necessary to design molecular magnets,[8a, 17, 20a, 25f, 31] focus has shifted towards systems with only one or two transition metal ion and fascinating progress has been made towards high-temperature SMMs.86-98 Our contributions to the field range from the development of electronic structure methods to high-level applications using multireference electronic structure theory. Importantly, we have developed the method of ‘Ab initio ligand field theory’[8a, 16] that lets us deduce the classical ligand field parameters uniquely from multireference wavefunction calculations. This is invaluable for defining magnetostructural correlations and obtaining qualitative insights into the investigated systems (transition metals, lanthanides or actinides).[17, 31b, 31c, 31h, 31i]
Figure 12

Fig. 12: Ligand field theory serves as the language that connects geometric structure, electronic structure, molecular properties and reactivity. Ab initio ligand field theory (AILFT) provides a unique link between modern high-accuracy multireference electroic structure theory and LFT, thus linking computations to chemical concepts).
Figure 13

Fig. 13: Magneto-structural correlations for [Co(S-Ph)4]2- the first mononuclear complex that was reported to posses single molecule magnet properties. Left: Structure of the complex. Middle definition of the two angles theta and psi that describe the distortion of the complex from perfect tetrahedral. Right: Variation of the total energy and the zero-field splitting as a function of these two angles demonstrating two equi-energetic minima separated by a low barrier. In one minimum the complex features a small positive ZFS, in the other a large negative ZFS thus showing that minor perturbations such as second sphere effects excerted by the counter ions can lock the system into one or the other minimum).

(f)  Heterogeneous catalysis - We have shown that accurate wavefunction based methods can be applied to solids and surfaces without explicitly introducing periodic boundary conditions. While this approach is limited, it is also very powerful since with present day electronic structure know-how sufficiently large clusters can be treated such that cluster model is properly approaching the properties of the bulk system. This is demonstrated in Figure 14 by showing that a) cluster calculations at the DFT level approach the results of truly periodic cluster calculations and b) that DLPNO-CCSD(T) calculations converge with respect to cluster size.[32] Once carefully extrapolated to the basis set limit these DLPNO-CCSD(T) calculations were the first to predict binding energies to surfaces with an accuracy of 1 kcal/mol.[32] However, these studies are not limited to small molecule binding to surfaces. In collaboration with the department of Prof. Schlögl, we have shown that the same strategy of correlating calculations to spectroscopy and ultimately to reactivity that is so successful in the molecular realm, can be applied as well to heterogeneous catalysts thus opening fascinating avenues for future explorations in this important field.[33]
 

Molecular spectroscopy

Molecular spectroscopy

The department is involved in a wide range of advanced spectroscopic experiments that are aimed at obtaining geometric and electronic structure information on stable as well as transient open-shell transition metal species. Apart from standard laboratory equipment UV/vis, IR Raman, Fluorescence and NMR spectroscopy) the department focuses on the following techniques:

(a)  X-ray Absorption and Emission spectroscopy. Modern synchrotron based techniques allow for many exciting, element specific experiments to be performed. The group of Prof. DeBeer is actively involved in the development and application of new X-ray based techniques.[10a-d, 22b, 23a, 34]
Figure 17
Fig. 17: Mößbauer spectroscopy can be used to investigate reaction intermediates. In this example three different intermediates have been observed in the course of an enzymatic reaction.

(b)  Mößbauer spectroscopy is one of the most powerful tools for the investigation of iron containing enzymes, coordination complexes and materials. The group of Dr. Bill has a long term tradition on performing and analyzing Mößbauer spectra with and without an applied external magnetic field.[23b, 25a, 26-27, 35]
Figure 18
Fig. 18: High-resolution EPR combined with modern quantum chemistry provides extended insight into fine structural and electronic details. In this example, the HYSCORE spectra of nitrosyl-myoglobin have been successfully assigned on the basis of QM/MM calculations.

(c)  High resolution electron paramagnetic resonance is the most powerful technique to investigate paramagnetic molecules. In addition to our collaboration with the department of Prof. Lubitz this technique is implemented in our department in the group of Dr. Maurice van Gastel who is exploring novel techniques as well as applications in the fields of bioinorganic chemistry and energy research.[36]
Figure 19
Fig. 19: Resonance Raman spectroscopy provides a detailed electronic structure picture of the excited state that is excited. The vibrational pattern is characteristic for the chromophore and type of excitation.

(d)  Resonance Raman spectroscopy is a particularly powerful technique for the investigation of chromophores. This technique is represented in our department by Dr. Maurice van Gastel who is developing the instrumental as well as theoretical aspects of the technique.[8c, 12, 37] Using resonance Raman spectroscopy one obtains highly and selectively vibrationally resolved information about absorbing species. Besides carrying a wealth of electronic structure information, the enormous enhancement of the inelastic response of a system once excited in the area of an absorption band provides extremely powerful fingerprints that allow for the characterization of elusive species.[37a]
Figure 20
Fig. 20: MCD spectroscopy provides high-resolution electronic structure insight as well as an optical probe of the ground state magnetic properties. In this example the magnetism of an exchange coupled transition metal dimer has been revealed by MCD spectroscopy (right). The MCD spectra are superpositions of the individual ion spectra with the signs being characteristic of the magnetic coupling pattern.

(e)  Magnetic Circular Dichroism spectroscopy is a powerful technique that bridges the fields of optical and magnetic spectroscopy. MCD, as applied to paramagnetic substances, provides a wealth of electronic structure information. In addition, variation of applied field and temperature allows for the optical measurement of the ground state magnetic susceptibility even in the presence of mixtures or impurities. The MCD laboratory is also headed by Dr. Bill using a home-designed setup that allows for spectra to be taken all the way from the deep UV to the near-IR regions.[13, 25a, 25e, 38]
 

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